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arXiv 0810.3546hep-ex
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用Belle观测含重夸克的候选奇异介子

Observation of candidate exotic mesons containing heavy quarks with Belle

S. -K. Choi

摘要:

我们报告的两个共振结构的观测$π^+ χ_{c1}$不变的质量分布在4.1 GeV附近的排他性$B\to Kπ^+χ_{c1}$衰变。一个详细的达利兹图分析表明,这些结构不能产生的反射从任何已知的和可能未知的共振在$Kπ$通道。如果这两个峰是由$π^+χ_{c1}$通道中的共振产生的,那么它们的最小夸克结构必须是$c\bar{c}u\bar{d}$四夸克排列,类似于Belle去年在$B\to Kπ^+ψ^{'}$衰变产生的$π^+ψ^{'}$质量分布中报告的$Z^+(4430)$结构。此外,我们还报道了X(3872)介子和由初态辐射产生的$1^{--}$ $Y$态的一些新的性质测量结果。%和其他最新的XYZ结果。分析是基于一个大的数据样本记录在$Υ(4S)$共振和附近的连续与贝尔探测器在KEKB不对称能量$e^+e^-$对撞机。

英文摘要:

We report the observation of two resonance-like structures in the $π^+ χ_{c1}$ invariant mass distribution near 4.1 GeV in exclusive $B\to Kπ^+χ_{c1}$ decays. A detailed Dalitz-plot analysis demonstrates that these structures cannot be produced by reflections from any known and possibly unknown resonances in the $Kπ$ channel. If these two peaks are produced by resonances in the $π^+χ_{c1}$ channel, their minimal quark structure would have to be a $c\bar{c}u\bar{d}$ tetraquark arrangement, similar to that proposed for the $Z^+(4430)$ structure reported by Belle last year in the $π^+ψ^{'}$ mass distribution produced in $B\to Kπ^+ψ^{'}$ decays. In addition, we report some new measurements on the properties of the X(3872) meson and the $1^{--}$ $Y$ states that are produced with initial state radiation. %and also other latest XYZ results. The analyses are based on a large data sample recorded at the $Υ(4S)$ resonances and nearby continuum with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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